The patch titled
cgroups: misc cleanups to write_string patchset
has been removed from the -mm tree. Its filename was
cgroups-misc-cleanups-to-write_string-patchset.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: cgroups: misc cleanups to write_string patchset
From: Paul Menage <menage@xxxxxxxxxx>
This patch contains cleanups suggested by reviewers for the recent
write_string() patchset:
- pair cgroup_lock_live_group() with cgroup_unlock() in cgroup.c for
clarity, rather than directly unlocking cgroup_mutex.
- make the return type of cgroup_lock_live_group() a bool
- use a #define'd constant for the local buffer size in read/write functions
Signed-off-by: Paul Menage <menage@xxxxxxxxxx>
Cc: Paul Jackson <pj@xxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxx>
Cc: Balbir Singh <balbir@xxxxxxxxxx>
Acked-by: Serge Hallyn <serue@xxxxxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/cgroup.h | 4 ++--
kernel/cgroup.c | 21 ++++++++++++---------
2 files changed, 14 insertions(+), 11 deletions(-)
diff -puN include/linux/cgroup.h~cgroups-misc-cleanups-to-write_string-patchset include/linux/cgroup.h
--- a/include/linux/cgroup.h~cgroups-misc-cleanups-to-write_string-patchset
+++ a/include/linux/cgroup.h
@@ -21,11 +21,13 @@
struct cgroupfs_root;
struct cgroup_subsys;
struct inode;
+struct cgroup;
extern int cgroup_init_early(void);
extern int cgroup_init(void);
extern void cgroup_init_smp(void);
extern void cgroup_lock(void);
+extern bool cgroup_lock_live_group(struct cgroup *cgrp);
extern void cgroup_unlock(void);
extern void cgroup_fork(struct task_struct *p);
extern void cgroup_fork_callbacks(struct task_struct *p);
@@ -295,8 +297,6 @@ int cgroup_add_files(struct cgroup *cgrp
int cgroup_is_removed(const struct cgroup *cgrp);
-int cgroup_lock_live_group(struct cgroup *cgrp);
-
int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen);
int cgroup_task_count(const struct cgroup *cgrp);
diff -puN kernel/cgroup.c~cgroups-misc-cleanups-to-write_string-patchset kernel/cgroup.c
--- a/kernel/cgroup.c~cgroups-misc-cleanups-to-write_string-patchset
+++ a/kernel/cgroup.c
@@ -1329,10 +1329,10 @@ enum cgroup_filetype {
* cgroup_lock_live_group - take cgroup_mutex and check that cgrp is alive.
* @cgrp: the cgroup to be checked for liveness
*
- * Returns true (with lock held) on success, or false (with no lock
- * held) on failure.
+ * On success, returns true; the lock should be later released with
+ * cgroup_unlock(). On failure returns false with no lock held.
*/
-int cgroup_lock_live_group(struct cgroup *cgrp)
+bool cgroup_lock_live_group(struct cgroup *cgrp)
{
mutex_lock(&cgroup_mutex);
if (cgroup_is_removed(cgrp)) {
@@ -1349,7 +1349,7 @@ static int cgroup_release_agent_write(st
if (!cgroup_lock_live_group(cgrp))
return -ENODEV;
strcpy(cgrp->root->release_agent_path, buffer);
- mutex_unlock(&cgroup_mutex);
+ cgroup_unlock();
return 0;
}
@@ -1360,16 +1360,19 @@ static int cgroup_release_agent_show(str
return -ENODEV;
seq_puts(seq, cgrp->root->release_agent_path);
seq_putc(seq, '\n');
- mutex_unlock(&cgroup_mutex);
+ cgroup_unlock();
return 0;
}
+/* A buffer size big enough for numbers or short strings */
+#define CGROUP_LOCAL_BUFFER_SIZE 64
+
static ssize_t cgroup_write_X64(struct cgroup *cgrp, struct cftype *cft,
struct file *file,
const char __user *userbuf,
size_t nbytes, loff_t *unused_ppos)
{
- char buffer[64];
+ char buffer[CGROUP_LOCAL_BUFFER_SIZE];
int retval = 0;
char *end;
@@ -1403,7 +1406,7 @@ static ssize_t cgroup_write_string(struc
const char __user *userbuf,
size_t nbytes, loff_t *unused_ppos)
{
- char local_buffer[64];
+ char local_buffer[CGROUP_LOCAL_BUFFER_SIZE];
int retval = 0;
size_t max_bytes = cft->max_write_len;
char *buffer = local_buffer;
@@ -1518,7 +1521,7 @@ static ssize_t cgroup_read_u64(struct cg
char __user *buf, size_t nbytes,
loff_t *ppos)
{
- char tmp[64];
+ char tmp[CGROUP_LOCAL_BUFFER_SIZE];
u64 val = cft->read_u64(cgrp, cft);
int len = sprintf(tmp, "%llu\n", (unsigned long long) val);
@@ -1530,7 +1533,7 @@ static ssize_t cgroup_read_s64(struct cg
char __user *buf, size_t nbytes,
loff_t *ppos)
{
- char tmp[64];
+ char tmp[CGROUP_LOCAL_BUFFER_SIZE];
s64 val = cft->read_s64(cgrp, cft);
int len = sprintf(tmp, "%lld\n", (long long) val);
_
Patches currently in -mm which might be from menage@xxxxxxxxxx are
origin.patch
memrlimit-add-memrlimit-controller-documentation.patch
memrlimit-setup-the-memrlimit-controller.patch
memrlimit-cgroup-mm-owner-callback-changes-to-add-task-info.patch
memrlimit-add-memrlimit-controller-accounting-and-control.patch
memrlimit-improve-error-handling.patch
memrlimit-improve-error-handling-update.patch
memrlimit-handle-attach_task-failure-add-can_attach-callback.patch
make-cgroup_seqfile_release-static.patch
add-a-refcount-check-in-dput.patch
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